TO CAPTURE SMOOTH MOTION

When shooting moving subjects, such as water or waterfalls, you can use a slow shutter speed to create a sense of blur and movement. In bright light, this can lead to overexposure. An ND filter allows you to use a slower shutter speed without overexposing your image. This is especially useful for landscape photography, where you want to capture the smooth movement of water or clouds.

TO CREATE A SHALLOW DEPTH OF FIELD IN BRIGHT LIGHT

If you want to blur the background of your photo, you need to use a wide aperture. In bright light, this can lead to overexposure. An ND filter allows you to use a wider aperture without overexposing your image. This is a good feature for portrait photography, where you want to focus attention on your subject by blurring the background.